As a UK diplomat, Ivan Rogers is not subject to the EU revolving door rules. The UK has its own revolving door rules which govern UK civil servants when they leave the government, although these do not appear to apply to incoming appointees, only when officials leave government for a new external post.
Ivan Rogers is a seasoned UK diplomat who has had several spins through the revolving door before being appointed as the UK's Permanent Representative to the EU in September 2013 (to start in November 2013). He rejoined the UK government in October 2011 as David Cameron's Adviser on Europe and Global Issues, from Barclays Capital where he had been Head of the Public Sector Industry Group, UK and Ireland since 2010. Ivan Rogers also worked for Citigroup from 2006 to 2010 where he was the Head of UK (and Brussels institutions) Public Sector Group.
He had joined the private sector after stints as Principal Private Secretary to Prime Minister Tony Blair 2003-06. From 1999-2003 he was Director of EU Policy and Strategy, and then Director of Budget and Tax Policy at HM Treasury. This was preceded by a spell as Chief of Staff to the Vice President of the European Commission (Leon Brittan) from 1996 to 1999.
More information: http://www.number10.gov.uk/news/senior-adviser-appointed/
"At a time when there needs to be improved regulation of big finance at the EU level, it's pretty shocking that the new UK ambassador to the EU will be someone who, until a couple of years ago, was working for a major bank. There needs to be a far tougher approach to regulating revolving door cases, both in the UK and in Brussels too. Afterall, Ivan Rogers will be the most senior diplomat handling European affairs for the UK government. His move from the corporate finance sector back to government appears to have been unregulated, despite the risk that conflicts of interest could arise."